Why do we have teeth and how are they different to those of other animals? Life processes - Humans and other animals - Teeth Learning Points Different teeth serve different functions. Carnivores, omnivores and herbivores have different types of teeth. Humans have two sets of teeth: milk teeth and adult teeth. A Twig Curriculum Film. Delivering key learning points. Get straight to the facts in just three minutes – directly linked to core learning, Twig's curriculum films will fit neatly into your lesson plans.